Juan Battle and Earl Wright II published W. E. B. Du Bois's Talented Tenth: A Quantitative Assessment in the Journal of Black Studies, 32:6 (2002):654-672. It can be downloaded from Dr. Wright's web site as a PDF file.
In the United States, the size of parking spaces varies. Typically they fall between 7.5 to 9 feet wide and 10 to 20 feet long. The most common size is 8.5 feet wide by 19 feet long.
Residential Real Estate with 60+ answers. A typical parking space is 9' wide and 18' long. Minimum width should be no less than 8'. Most municipalities have zoning laws that set forth the minimum and/or maximum dimensions of garages, driveways and off-street parking spaces. Contact your local building department for the minimum width of driveways in your area.